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Proof step 7 from proof is_valid_ref-void (previous step)

st[r -- _type] = typeval(void_type), is_valid_ref(r, st) ⊦ r = jvmref, (¬ class+∃(str, void_type .class) ∨ is_abstract(void_type .class) ∨ ¬ is_obj(r, st)) ∧ ¬ is_array(str, r, st)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ is_array(str, r, st) ↔ type∃(str, st[r -- _type] .type) ∧ st[r -- _type] .type .jtelemtype ≠ void_type ∧ st[r -- _type] .type .jtelemtype ≠ abstract_type ∧ is_array(r, st)
Proof step 6:
st[r -- _type] = typeval(void_type), is_valid_ref(r, st) ⊦ r = jvmref, (¬ class+∃(str, void_type .class) ∨ is_abstract(void_type .class) ∨ ¬ is_obj(r, st)) ∧ ¬ ( type∃(str, st[r -- _type] .type) ∧ st[r -- _type] .type .jtelemtype ≠ void_type ∧ st[r -- _type] .type .jtelemtype ≠ abstract_type ∧ is_array(r, st))

Rule argument

[speclemmaarg: , is_array(str, r, st) ↔ type∃(str, st[r -- _type] .type) ∧ st[r -- _type] .type .jtelemtype ≠ void_type ∧ st[r -- _type] .type .jtelemtype ≠ abstract_type ∧ is_array(r, st) ,[st, r, str] → [st, r, str] ,F ,okfuns , ,is-real-array-def ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (st, r, str)]]